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题库 / Prep2007E1-SC-140
In human hearing, subtle differences in how the two ears hear a given sound help the listener determine the qualities of that sound.
in how the two ears hear a given sound help the listener determine
in the two ears hearing a given sound help the listener in determining
in how a sound is heard by the two ears helps the listener determine
between how the two ears hear a given sound helps the listener in determining
between how a sound is heard by the two ears help the listener in determining
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difference in two ears 不恰当，排除B
A correct
Idiom: help do sth. / help to do sth. / help sb. do sth. / help sb. to do sth. / help in doing sth.
主语是复数，动词也要用复数 排除C
AB区分：
A，differences in how the two ears hear a given sound，how引导名词性从句，句子核心是：“两只耳朵如何听一个声音的差异”
B，differences in the two ears hearing a given sound，句子核心是：“两个耳朵的差异”，“听一个声音”作ears的定语，置于differences从句的第二层，没有A的表达效果好。"
(B) in the two ears hearing … 去掉how改变原文要表达的含义;help in doing用法错误。
(C) 被动语态的表达没有必要;helps应该是help，因为其主语是复数differences。
(D) between应该是用于表达“二者之间”的含义，用于此处不正确;helps应该是help。
(E) between应该是用于表达“二者之间”的含义，用于此处不正确;被动语态的表达没有必要。
A，differences in how the two ears hear a given sound，how引导名词性从句，句子核心是：“两只耳朵如何听一个声音的差异”
B，differences in the two ears hearing a given sound，句子核心是：“两个耳朵的差异”，“听一个声音”作ears的定语，置于differences从句的第二层，没有A的表达效果好。
A，differences in how the two ears hear a given sound，how引导名词性从句，句子核心是：“两只耳朵如何听一个声音的差异”
C，differences in the two ears hearing a given sound，句子核心是：“两个耳朵的差异”，“听一个声音”作ears的定语，置于differences从句的第二层，没有A的表达效果好。
differences谓语动词用复数 排除C
help sb do sth 排除B
difference in one thing；difference between A and B
help sb in doing sth,帮助某人作某事
"In" is also used when you are referring to the difference between two things by pointing out the difference itself (i.e. the ONE thing that's different).
difference in 表示“在...方面的差异”，而difference between 表示“……与……之间的差异”，一般还与and连用，即difference between...and...句意是想说，在人类的听觉中，两个耳朵在听某种特定声音上的细小差别帮助他们来决定声音质量。
D用了helps，而主语是subtle differences，这个马上杀了。E用了被动，意思是两个声音被耳朵听见，与A是两个耳朵如何听到声音，感觉A更加顺更加舒服点。
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